Nothing reaches five inches
On this page11
Diameters are recorded for 220 of the 251 containers
Thirty one rows record none. For the rest the widest figure anywhere on this shelf is 4.625 inches.
Which means there is a ceiling, and it is worth stating plainly
No container on this shelf has a diameter of five inches. Not a narrow selection, not a handful: none.
And the approach to the ceiling is steep
189 rows reach two inches, 74 reach three, 54 reach 3.5, 7 reach four and 5 reach 4.5. The last inch of the range holds seven rows.
So three inches is the practical wide end
Seventy four rows, which is a real selection. Above that the shelf is down to two figures and then to single figures, and a specification written at four inches has almost nothing to resolve to.
A five inch embroidery hoop will not lie flat in anything here
Which is a statement about this shelf and not a criticism of it. The shelf is a small container shelf and a hoop is not a small part.
Hoop hardware is a different matter and it fits easily
The screw, wing nut, bracket and band are short. They need floor area rather than diameter, and 74 rows at three inches or more provide it.
The figure is an outside diameter, so the opening is smaller again
An outside diameter includes the wall. The neck finish is the number that describes the opening, and on this shelf the two widest finishes are 70-400 and 89-400 with 56 rows each.
Those two account for 112 of 251 containers between them
So the wide mouth end of this shelf is well supplied in closure terms even though the outside diameter tops out below five inches. The mouth and the body are two separate questions.
Nineteen rows record no neck finish and thirty one record no diameter
Which overlap only partly. For a shape sensitive job the practical effect is that a meaningful slice of the shelf cannot be screened on the dimension that matters, and has to be checked individually.
The surface area theme in the rule above is a coincidence worth noting
Part 303 measures a decoration as a fraction of an article’s surface area, which is a two dimensional measure. This shelf is also limited in two dimensions rather than by volume. The two facts are unrelated and the habit of thinking in area rather than amount serves both.